[self doAction:@"testA" andArgObject:nil];
[self doAction:@"testB:" andArgObject:@"xixi"];


-(void) doAction:(NSString *)methodsName andArgObject:(id)objectArg
{
    SEL selector = NSSelectorFromString(methodsName);
    if (self)
    {
        if ([self respondsToSelector:selector])
        {
            [self performSelectorOnMainThread:selector withObject:objectArg waitUntilDone:NO];
        }
    }
}

-(void) testA
{
    NSLog(@"do testA");
}

-(void) testB:(NSString *) str
{
    NSLog(@"do testB :%@",str);
}

结果 log

2016-08-10 12:18:04.823 [94548:2783958] do testA
2016-08-10 12:18:05.602 [94548:2783958] do testB :xixi